I'm in the same boat with my car. I'd like to preserve the stock radio and make use of my empeg without having it be an auxiliary device. I'm pretty sure I lose climate controls if I remove the stock HU, so that's why I'm leaning towards dual op.

I'm toying with the idea of putting both devices on the speaker line with an A/B switch of some sort to choose which device is allowed to output. I guess I'd have to route the stalk interface through that switch as well.

Really, I'm just making stuff up and have no idea whether this is really a viable option.